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Originality and Condition are key. We don't know enough yet to give you a true value. These pistols can run anywhere from $1500 for a rebuilt example to $6000 for a pristene, all original and correct pistol.

Some characteristics exclusive to the US&S 1911a1's: circular milling marks around the barrel bushing, blued trigger, and 32 knurls on the MSH (count 2nd row top to btm). Any and all photos welcome but try to get those areas.

I don't know the fine details that matter a lot to collectors, but it looks pretty straight to me, and in excellent condition. Worth a good bit of money, US&S made fewer guns than anybody but Singer. Still 55,000 pistols, though.
RCD- Lt Col Robert C. Downie, chief inspector for guns made at US&S.
P - Proof tested.
HS - High Standard barrel, correct for the make.

What's that mark on the slide between the rear sight and the ejection port, towards the left side of the slide? It looks like a "P" but if it is a "P" isn't that supposed to be centered on the slide much closer to the rear sight and with the lower line of the letter pointing to the rear of the slide?

The mark in the last picture appears to be a hardness test mark, but I could be wrong. Nowhere near being an expert on those old babies.

US&S pistol

You have a "HS" barrel manufactured by High Standard. The grips are early Keyes Fibre as distinguished by the NO reinforced screw holes. The trigger is blued which is correct for US&S 1911a1's. Count the knurls / checks on the 2nd row (top to btm) on the mainspring housing.......you should get 31 +/-1. Should you get 27 +/-1 then chances are it is early Colt / Ithaca. Also, take a look at the muzzle end of the barrel bushing.......most if not all US&S barrel bushings were not finished out smooth and will display circular milling marks. Ok.........here is the bad news, looks like the finish is different from the slide and frame. There were 3 different types / variants of the US&S slide 1) NO "P" stamp on the slide to about serial number 1,060,000 2) "P" stamp to the left of the rear sight like the one photographed from about serial number 1,060,000 to about 1,082,000 3) "P" stamp centered and in front of the rear sight from about serial number 1,082,000 to the end of their contract. This information can be found on coolgunsite.com as referenced from Charles Clawson's "1911/1911a1" bible. Looks like you have a type 3 US&S with a type 2 slide. Hope this information helps.

A ? does the fact that there was X amount of guns made by different company the only thing that makes them rare or collectable,as i recall there was only 500 singer guns made.they are the most valued.are they diffrent quality?

The main factors are originality, condition, and scarcity.
The Singer is nicely made but its extreme rarity is what governs. The legend is that they were so well made that the company's efforts were considered wasted on mere guns and they were contracted to build artillery fire directors (not bombsights as commonly said.)

The first run of Remington Rands were pretty rough, but they did not make many before there was a clampdown on quality and interchangeability. So the Type 1 with distinctive company roll mark is worth a premium.

It has gotten so bad that the collectors and speculators will ooh and aah over an inspector's mark if he was not on the job very long.
Look at these guys,
WTG: Walter T Gorton Colt S/N 700,000-710,000
CSR: Charles S Reed Colt S/N 717,282-723,000
The GUNS are the same as when inspected under orders of Guy H. Drewry, who oversaw hundreds of thousands of Colt pistols, but that one little stamp from somebody there only a short time adds a lot of dollar value.

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